141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/term.h>
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#include <grub/i386/relocator.h>
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#include <grub/relocator_private.h>
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extern grub_uint8_t grub_relocator32_start;
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extern grub_uint8_t grub_relocator32_end;
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extern grub_uint8_t grub_relocator_forward_start;
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extern grub_uint8_t grub_relocator_forward_end;
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extern grub_uint8_t grub_relocator_backward_start;
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extern grub_uint8_t grub_relocator_backward_end;
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extern void *grub_relocator_backward_dest;
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extern void *grub_relocator_backward_src;
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extern grub_size_t grub_relocator_backward_size;
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extern void *grub_relocator_forward_dest;
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extern void *grub_relocator_forward_src;
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extern grub_size_t grub_relocator_forward_size;
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extern grub_uint32_t grub_relocator32_eax;
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extern grub_uint32_t grub_relocator32_ebx;
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extern grub_uint32_t grub_relocator32_ecx;
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extern grub_uint32_t grub_relocator32_edx;
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extern grub_uint32_t grub_relocator32_eip;
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extern grub_uint32_t grub_relocator32_esp;
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#define RELOCATOR_SIZEOF(x) (&grub_relocator##x##_end - &grub_relocator##x##_start)
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grub_size_t grub_relocator_align = 1;
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grub_size_t grub_relocator_forward_size;
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grub_size_t grub_relocator_backward_size;
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grub_size_t grub_relocator_jumper_size = 10;
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void
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grub_cpu_relocator_init (void)
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{
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grub_relocator_forward_size = RELOCATOR_SIZEOF(_forward);
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grub_relocator_backward_size = RELOCATOR_SIZEOF(_backward);
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}
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void
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grub_cpu_relocator_jumper (void *rels, grub_addr_t addr)
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{
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grub_uint8_t *ptr;
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ptr = rels;
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/* movl $addr, %eax (for relocator) */
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*(grub_uint8_t *) ptr = 0xb8;
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ptr++;
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*(grub_uint32_t *) ptr = addr;
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ptr += 4;
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/* jmp $addr */
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*(grub_uint8_t *) ptr = 0xe9;
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ptr++;
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*(grub_uint32_t *) ptr = addr - (grub_uint32_t) (ptr + 4);
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ptr += 4;
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}
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void
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grub_cpu_relocator_backward (void *ptr, void *src, void *dest,
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grub_size_t size)
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{
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grub_relocator_backward_dest = dest;
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grub_relocator_backward_src = src;
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grub_relocator_backward_size = size;
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grub_memmove (ptr,
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&grub_relocator_backward_start,
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RELOCATOR_SIZEOF (_backward));
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}
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void
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grub_cpu_relocator_forward (void *ptr, void *src, void *dest,
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grub_size_t size)
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{
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grub_relocator_forward_dest = dest;
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grub_relocator_forward_src = src;
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grub_relocator_forward_size = size;
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grub_memmove (ptr,
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&grub_relocator_forward_start,
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RELOCATOR_SIZEOF (_forward));
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}
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grub_err_t
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grub_relocator32_boot (struct grub_relocator *rel,
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struct grub_relocator32_state state)
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{
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grub_addr_t target;
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void *src;
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grub_err_t err;
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grub_addr_t relst;
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err = grub_relocator_alloc_chunk_align (rel, &src, &target, 0,
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(0xffffffff - RELOCATOR_SIZEOF (32))
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+ 1, RELOCATOR_SIZEOF (32), 16);
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if (err)
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return err;
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grub_relocator32_eax = state.eax;
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grub_relocator32_ebx = state.ebx;
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grub_relocator32_ecx = state.ecx;
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grub_relocator32_edx = state.edx;
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grub_relocator32_eip = state.eip;
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grub_relocator32_esp = state.esp;
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grub_memmove (src, &grub_relocator32_start, RELOCATOR_SIZEOF (32));
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err = grub_relocator_prepare_relocs (rel, target, &relst);
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if (err)
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return err;
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asm volatile ("cli");
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((void (*) (void)) relst) ();
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/* Not reached. */
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return GRUB_ERR_NONE;
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}
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